It reflects the Eastern view of life as cyclical versus the Western view of life as linear..life flows in a dance of duality...summers are warm but winters cold ..the weather is bad but later the weather is good.. things go up and down . part of natures balances. ..the two little dots of opposite color within the symbol mean that within everything lies the seed of its opposite..high gives way to low ..Trying to force life to be one facet only is unwise.. let nature unfold and watch from the center ..